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Hepatic sinusoidal obstruction syndrome (SOS) is an obliterative venulitis of the terminal hepatic venules, which in its more severe forms imparts a high risk of mortality. SOS, also known as veno-occlusive disease (VOD), occurs as a result of cytoreductive therapy prior to hematopoietic stem cell transplantation (HSCT), following oxaliplatin-containing adjuvant or neoadjuvant chemotherapy for colorectal carcinoma metastatic to the liver and treated by partial hepatectomy, in patients taking pyrrolizidine alkaloid-containing herbal remedies, and in other particular settings such as the autosomal recessive condition of veno-occlusive disease with immunodeficiency (VODI). A central pathogenic event is toxic destruction of hepatic sinusoidal endothelial cells (SEC), with sloughing and downstream occlusion of terminal hepatic venules.

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Gemtuzumab ozogamicin (GO) is a chemotherapy-conjugated anti-CD33 monoclonal antibody effective in some patients with acute myeloid leukemia (AML). The optimal treatment schedule and optimal timing of GO administration relative to other agents remains unknown. Conventional pharmacokinetic analysis has been of limited insight for the schedule optimization.

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Purpose: Gemtuzumab ozogamicin (GO) has been associated with an increased risk of liver sinusoidal obstruction syndrome (SOS) when applied within 3 months of allogeneic hematopoietic cell transplantation (HCT). We hypothesized that GO might be safe and effective as part of a reduced-intensity conditioning regimen as salvage therapy of CD33+ acute myeloid leukemia.

Experimental Design: Thirty-one patients with acute myeloid leukemia which relapsed following conventional therapy (n=15), autologous (n=3), or allogeneic (n=13) HCT were included in a prospective phase I/II trial.

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